Endless power-transmission belt



July 7, 1925.

L. M. SHIATTE ET AL ENDLESS POWER TRANSMISSION BELT Filed Feb. 5. 1923 2 Sheets-Sheet l IT'IVEI'ITOTS). Ludovic M. Shnoflc Gertrude E. Knapp Arthur 5. Brown July 7, 1925. 1,545,206

1.. M. SHIATTE ET AL ENDLESS POWER TRANSMISSION BELT Filed Feb. 5. 192: 2 Sheets-Sheet 2 lnvemors. LUdOVlC M. Shlohe GerTrude E. Knapp Ar1hur 5. Brown bYMM-J-MWW Anya Patent ed July 7, 19235.

UNITED STATES PATENT OFF1E.

LUDOVIC M. SI-IIATTE, GERTB E E KN PP. AND RTHUR S. BROWN, OF TILTON,

HAMPSHIRE.

ENDLESS POWEK-TRANSMISSTON BELT.

Application filed February 3, 1923v To all whom it may concern:

Be it known that we,LUnov1o M. SHIATTE, GERTRUDE E. KNAPP, and ARTHUR t5. BROWN, citizens of the United States, and residents of Tilton, county of Bellmap, State of New Hampshire, have invented an Improvement in Endless Power-Transmission Belts, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts,

This invention relates to endless power transmission belts and has for its object to provide a novel belt of this type which s practically nonestretchable, which has superior wearing qualities and which has other advantageous features all as Wlll be more fully hereinafter set forth,

In making our improved belt we first form a loop which has a size corresponding to that of the belt to be made from either a single strand of twine, string, yarn or the like or a plurality of parallel strands and then we wind either a single strand of string, twine, yarn or the like or a plurality of strands about a loop thus formed and n widely separated turns and continue this winding operation until the body of the belt has been built up to the desired size.

The strand or strands from which the belt is made are maintained under even tension during the winding operation so that when the body of the belt is completed the continuous strand or strands will be under uniform tension throughout. The body is preferably provided with a covering to protect it from wear and this covering is in the form of a tape which is wound spirally on the body preferably with the turns of'the tape in overlapping relation. The covering is held in place and the belt is maintained in its desired shape by rows of stitches extending lengthwise of the belt, each stitch passing transversely through the belt. This stitching retains the coverin firmly in place and also retains the shape of the belt. The fact that the body of the belt is made up of a strand or strands which are of uniform tension throughout its length results in producing a belt of superior strength because any strain on the belt will be distributed equally throughout the length of 611. 1} SUi IlCl.

Serial N0. 616,809.

Moreover since in building up the body each coil of the strand as it is laid around the loop is wound on the body with long spiral turns, the belt is practically non-stretchable.

In order to give an understanding of the invention we have illustrated in the drawings some selected embodiments thereof which will now be described after which the novel features will be pointed out in the appended claims.

In the drawings, Fig. l is a View illustrating the first steps in the process of making the belt.

Fig. 2 illustrates the belt after the body has been formed.

Fig. 3 illustrates the way in which the covering is applied to the body of the belt.

Fig. 4 is a perspective sectional view showing the completed belt.

Figs. 5 and 6 show steps in the manufacture of a belt in which a plurality of strands are laid simultaneously;

Fig. 7 is a cross sectional view of a V belt embodying the invention.

Our improved belt is made from one or more continuous strands of cord, twine, yarn, string or the like, the character of which will depend upon the character of the belt desired.

The first step in forming the belt is to make a loop corresponding in size to that of the desired belt, and this loop may be made either from a single strand or from a plurality of strands. This loop forms in effect a core about which the body of the belt is built up. After the loop is thus made then one or more strands are wound about the loop and the structure thus formed, in long spiral turns and continuously in the same direction, this winding continuing until a belt body has been built up to the desired size.

In Figs. 1 and 2 we have shown a construction wherein the belt is made from a single strand while in Figs. 5 and 6 we have illustrated a construction in which the belt is made from a plurality of strands.

Referring first to Figs. 1 and 2, 2 indicates a strand or filament from which the belt is made and in making the belt the first step is to form a loop 1 from one end of the st an 2 and of a s ze e espon ns to th of the belt desired. After the loop 1 has been formed then a continuous length of the strand 2 is wound about the loop 1 as a core in long spiral turns, as indicated at 3, the turns of the winding being widely separated so that the wound strand lies nearly parallel to the core 1. This winding of the strand 2 is carried throughout the length of the coil 1 and then is continued about the structure thus formed until the body l of the belt has been built up to the desired size. The winding of this continuous strand will preferably be always in the same direction and the turns 3 of the strand will pass around the core always in the same direction. The portion of the strand 2 which extends from any one point in the belt around the latter back to this point again constitutes a loop which is wound about the previously assembled loops or structure as thus far made with a long spiral winding having the turns thereof widely separated. Every portion of the strand 2 thus extends nearly parallel to the core 1 and longitudinally of the belt and by building up the belt by taking each loop and thus winding it about the previously assembled loops with the long spiral winding a very compact belt is pro vided in which the various loops are bound together by the winding process so that there is no danger that the strands will separate.

In building the belt it is very desirable that the loops of the strand 2 should be laid and wound about the previously laid loops under an even tension so that when the belt is completed the continuous strand will be under substantially uniform tension throughout its entire length.

Instead of making the belt entirely from a single strand we may, if desired, use a plurality of strands and this construction is illustrated in Figs. 5 and 6. lhe number of strands which are used may be varied without departing from the invention. In Figs. 5 and 6 we have shown four strands and in making a belt embodying our invention with four strands 2 we first form a loop 10 in the ends of the strands as indicated in Fig. 5, which loop is of the size of the desired belt, and then the four strands 2 are twisted about said loop 10 as a core in long spiral turns 3 until the twisting has been carried throughout the length of the core 10 after which the twisting is continued over the structure thus formed and is repeated until the body i of the belt is built up to the desired size. The

only difference between the structure shown in Figs. 5 and 6 and that shown in Figs. 1 and 2 is that in one case a single strand only is used while in the other case a plurality of strands are used. The advantage of using a plurality of strands it that the body mav be built up to the desired size more rapidly. In each case, however, the strands are laid in loops, each of which is twisted about the previously assembled loops with a long spiral winding. In other words, a core is formed and then the strand or strands are twisted about the core and about the structure thus formed with long spiral turns until the belt body is built up to the desired transverse dimension.

After the body has thus been built up to the desired size the belt is finished by winding thereon a covering and stitching the covering to the belt. This covering is in the form of a. tape 5 which is wound about the body as illustrated in Fig. 3, and preferably in such a way that the turns 8 of the tape will have an overlapping relation.

This overlapping relation of the turns 8 of the covering tape not only serves to bind the turns together but also gives a covering of double thickness.

After the covering has been applied the belt is stitched through and through to form rows of stitching 6 that extend longitudinally of the belt, the stitches of each row extending transversely through the belt. These stitches may extend diametrically through the belt as shown in Fig. 4, or may extend through the belt at one side of the center as shown in Fig. 7. Where the stitches extend diametrically of the belt they serve to preserve a round transverse sectional shape to the belt. If it is desired to make a belt then one row of stitches 14 may be inserted through the belt at one side of the center thereby drawing the surface of the belt together slightly at the points where the stitches enter and leave the belt and causing it to bulge, as shown at 15, and other rows of stitches 16 and 17 may also be inserted through the belt causing a corresponding distortion of the cross sectional shape which produces the V belt illustrated. Where the stitching employed in Fig. 4 is shown any desired number of rows of stitches may be used depending on the size and character of the belt.

This manner of stitching the belt transversely through and through serves to retain the covering firmly in place and also assists in maintaining the desired cross sectional shape of the belt.

A belt made as above described is extemely strong, has superior wearing qualities, and is practically nonstretchable. is the combined strength of all the loops or coils of the strand or strands 2 and as the strands are laid in the coils under uniform tension any strain to which the belt is subjected will be evenly distributed throughout the entire length of each strand. F urthermore by having the loops individually laid and each loop wound about the previously laid loops with the long spiral winding a very compact body is provided. Furthermore because of the fact that each coil is Its strength 4 laid with the long spiral Winding about the previous coil the strand in each loop lies nearly parallel to the length of the belt and this produces the non-stretchable quality of the belt.

Ve claim:

1. An endless belt comprising a body portion formed of strand coils Wound in long spirals With Widely separated turns and a plurality of rows of stitches extending longitudinally of, and passing transversely through, the body portion and acting to preserve the required cross sectional shape of the body portion.

2. An endless belt comprising the con- 15 struction defined in claim 1 including a fabric tape Wound around and covering the body portion and held in place by the said rows of stitches.

In testimony whereof, we have signed our names to this specification.

LUDOVIC M. SHIATTE. GERTRUDE E. KNAPP. ARTHUR S. BROWN. 

